The Guardian of the Gates told the friends that they must put on glasses before entering the Emerald City as the brightness of the city would blind them.
Explore these websites and videos to find out more about spectacles.
Why do some people need glasses?
Not everyone needs glasses to help them see but most people wear sunglasses when it is really sunny outside.
Challenge yourself!
Can you design an amazing pair of sunglasses for a fictional character of your choice? It could be a character from Oz, another book you have read, a game you play or a film you have seen.
Think about the character and how you would make these glasses suit the personality of your character.
You can also look at the Help with Challenges page to come up with your own spectacles challenge.
